Let-off mechanism



April s, 1924;

F. VERSAVEL ET AL.

LET-OFF MECHANTSM Filed A1191. 'E4 1921 3 Sheets-Sheet l IN VEN T055# FANcfS VRSA YEL GASTON VERSA VEL ODOLPHE VE RSA VEL @RSA1/'EL f AT TURA/EY April 8, i924; BASQZ F. VERS/WEL ET Al.

LET-OFF MECIvIISANISB/IV Filed A112. 24 1921 GA s TUN VE 35A VEL ROD OL PHE VERSA VEL y April s, 1924; l mss/,m

F. VERSAVEL ET AL LET-0FF MECHANISM Filed Aug. 24. 1921 5 Sheets-Sheet 5 FRANCIS VEESA VEL y GASTON VERSA VEL RODOLPEE VEESA VEL .REO 'f 'SAVEL 1 TTQENE Y,

NVEN T035.-

Patented Apr., 8, 1924.

STATES PATENT oralese FRANCIS VERSAVEL, GASTON VERSAVEL, RODGLPEE VERSAVEL, AND RAOUL VEBSAVEL, 0F ROUBAIX, FRANCE.

LET-OFF MECHANISM.

Application filed August 24, 1921. Serial No. 494,933.

To ail whom it may concern:

Be it known that we, FRANCIS VERsAvEL, GASTON VERsAvEL, RoDoLrHE VERsAvEL, and RAOUL VERsAvEL, citizens of the French Republic, and residents of Roubaix, France, have invented certain new and useful Im,- provements in Let-Ofi' Mechanism, of which the following is a specification.

This invention relates to improvements in devices for automatically and uniformly .winding off threads forming the warp in the manufacture of fabrics on weaving looms. l

The object of our invention is to provide an improved device of this kind, wherein the usual cords and brake-disks serving to produce the resistance against the Winding 0R of the threads are om1tted. 'y

A further object is to provide a device of the kind described, wherein the warp-beam upon which the threads are wound, instead of being journaled instationary bearings 0r in grooves in the frame of the weaving loom, is journaled in movable levers in such a way that the Warp beam with its warp threads is suspended and acts with its' total weight upon all the threads to stretch the same, the Warp-beam being still suiiiciently free to be raised and lowered to a certain extentv during the operation of the blades and the formation of the warp opening for the passage of the shuttle.

A further object of the invention is to provide an improved device of the kind described combined with a. warp delivering device, capable of winding ofiB the necessary length of threads without pull on the same, independently from the number of shoots or threads of the material used (silk, wool, cotton, jute and the' like).

ln order that the invention may be clearl understood, the same will be described wit reference to the accompanying drawings, wherein: v

Fig. 1 shows a side elevation of the improvedI device mounted on the levers carry- 1n the whole system.

ig. 2 is a pia-n view of the device;

Fig. 3 shows the lever which is opposite the levelshown in Figs. 1 and 2.

Fig. 4 shows a general view of the device mounted in place on a weaving lloom.

Fig. 5 shows a bipartite collar intended to held in place by means of a screw 1'.

ed on the pivot g is a .pawl s engaging and be fixed on the beam to impart movement to the same.

Mounted on each frame of the loom (Fig. 1) at the suitable place and secured by means of bolts is a bearing a, provided at its upper inner part with an integral finger al, on which the lever is adapted to rest. provided with an integral angle piece a2, to which .the pivot pin 23 of the picker whip 21 is secured. The socket portion of said bea-rin a has a bore, in which the shaft is journa ed. Another similar bearing is provided for the opposite end of the shaft means of a key c is a lever d, on which are arranged the various parts of the system. Said parts comprise a ivot pin e on which the vertical lever f is pivoted. Said leverl is actuated by means of a pitman h provided with a pivot-pin g. rThe reciprocating movement is produced by mea-ns of an eccentric disk (not shown in the drawin mounted on any suitable rotating memr of the loom. Pivotally connected to the upper end of the lever f by means of a pivotpin z' is a bar j provided with a nose v serving to actuate the pivot g by its reciprocat- .ing movement. Towards the outer end of the lever d, a part k is secured, said part being provided with a vertical axis l havin a worm and to the upper part of which a sleeve 1 is secured vby means of a screw 2. Pivoted on the axis Z between said sleeve 1 and the ratchet wheel m is an angle piece p, having a bore for the reception of the pivot g Mountactuating the ratchet wheel n. Passing around the socket of the piece p is a spring t, one end of which is held 'by a screw u on the art m. The opposite end of said spring is bent at right angles and bears against the piece p to bring the same back against the part m after each operation of thel nose v of the bar j. Said part m also serves to hold in place the vertical axis Z by means of screws 25 and 26, said axis Z being also held at its lower part by means of screws 27 and A28. Secured to the lower part ofthe axis Z is a small brake pulley 15, the braking action of which is obtained by means of a collar lined with leather 14;, adapted m be tight/f lThellower parto said bearing is ened by means of a screw-threaded rod provided with a nut 17. Said rod is bent at 16 to a Suitable length, so that the brake collar 14 will be held bv the rod 13, for a. slight braking action. his brake serves to check the worm and is desirable on high speed looms for preventing a too rapid movement of the ratchet n. The worm m actuates the gear-wheel y, secured to the axis z and provided with an integral half-bearing for the reception of the shaft of the warp-beam. A second half-bearing has a chamber or notch 4 and is held by means of bolts 29 and 30. Housed within said chamber/1 (after 6 and 7 has been tightened on the wa.rpbeam) is the portion 5 of the bipartite collar 8. Engaged into the hole 12 is the hook of the rod.13. Between the screw-nuts 18 and 20, said rod 13 has a perforated ear 19 secured to the whip 21 bv means of a screw 22. Arranged on the whips 21 and 21 are weights 24 and 24 serving to stretch the warp. Secured to the opposite end of the shaft b by means of a key c1 is a lever d with its bearing 9, bolts l() and 11 and the hole 121, for the hook 131.

Besides the weight of the warp-beam with its material (warp-threads), the weight of the levers d and d and the mechanism, there are two whips 21 and 21 with adjustable weights 2a and 2a to hold the threads of the warp under tension as desired.

The warp-beam with its Warp threads 1s placed into the bearings of the levers d and fl and the warp threads are tensionedso that themechanism is in the position shown in Fig. 1.

Vhen the loom is in operation, an eccentric disk (not shown in the drawings) imparts a reciprocating movement to the pitman h and therefore to the bar y', pivot q and pawls, the latter engaging and rotating the ratchet-wheel n step by step, the rotating movement of the wheel n being transmitted by the worm as to the wheel y, the movement of which produces the winding off of the Warp through the agency of the collar S.

Should the pawl s deliver too great a length of warp, the' levers d and d would be lowered. At the same time it would move the pivot g away so that the nose v of the bar could no more reach it.. Thus 'said pawl would remain inoperative until said length of warp will be woven, when the levers d and d will be moved back to their normal positions.

If however the delivery of warp threads is insufficient, the levers d and d will be raised and the pivot q moved nearer to the nose o of the bar y', so that the latter will act longer on said pivot and the pawl s, whereby the ratchet-wheel n will be rotated to a greater number of teeth.

It will be understood that by the present arrangement of the system the apparatus does not deliver more than the materia-l which is necessary to the manufacture and it is the consumption'of material or warp threads itself which automatically regulates the winding off of material.

Having now fully described our said invention, what we claim and desire to secure by Letters Patent, is:

l. In a device for automatically and uniformly winding off the threads forming the warp of fabrics manufactured on weaving looms the combination with the warp-beam of movable levers to suspend said warpbeam so that the same acts with its full weight on said warp-threads. and an automatic device controlled by the position of the beam through said levers for winding oft' the warp-threads.

2. In a device for automatically and uniformly winding off the threads forming the warp of fabrics manufactured on weaving looms, the combination with the warp-beam of movable levers adapted to receive said warp-beam so that the same is suspended thereon and acts with its full weight on said warp-threads, an auto-matic device for winding off the warp-threads, and means whereby the positive movement of the warp delivering device is regulated by the tension of the warp threads incident to their consumption.

3. The combination with a warp beam` of levers for movably supporting said beam, and means adapted in operation to positively rotate the beam, the-operation of said means being controlled by the position of said beam resultant from the tension of the warp threads incident to their consumption.

4. The combination of a. warp beam, pivotally mounted levers in which said warp beam is swingingly supported, means reciprocated from an independent source, and mechanism operated by said means to rotate the beam, the effect of Said mechanism on the beam heilig controlled by the swinging movement of the levers.

In testimony whereof we have hereunto set our hand in the presence of two witnesses.

FRANCIS VERSAVEL.

GASTON VERSAVEL.

RODOLPHE VERSAVEL.

RAGUL VER-SAVEL. Witnesses:

GERMAINE SPAENZ, WILLIAM LEEQ. 

